Anaerobic metabolism produces energy for short, intense exercise, lasting no more than a few minutes. A few minutes later the accumulated lactic acid reaches a certain limit, the so-called lactate threshold, and thus the person feels fatigue, pain and burning sensation in the muscles. Aerobic metabolism Aerobic metabolism produces energy for prolonged physical stress. For the synthesis of ATP from nutrient substances – proteins, fats and carbohydrates – used oxygen. This path is slower than the anaerobic, it involved the circulatory system, supplying oxygen to working muscles at a time, until the synthesis of ATP. Aerobic metabolism is mainly used during prolonged exercise of low intensity. During training, aerobic and anaerobic metabolism replace each other. At the beginning of exercise, ATP is produced by scheme of anaerobic metabolism.
As soon as breathing and pulse quickens, the body receives more oxygen and the body goes to the aerobic type of metabolism. Under this scheme, the body continues to work as long as reaches the lactate threshold. When this limit is reached, the oxygen is no longer enters the body quickly enough for the synthesis of ATP, so again "turned on" anaerobic metabolism. But this mechanism is designed for a short period time, so the athlete must reduce the intensity of exercise to prevent the formation of lactic acid. Restores body's energy reserves, depending on the intensity and duration physical activity as an energy source are the carbohydrates or fats. Fats are a good source of energy for long workouts, but under intense stress, such as Sprint, they are not used organism. If the intensity of the workout is low (when the heart rate less than 50 percent of the maximum), the body will use stored fat as an energy source for many hours, until body will do enough oxygen needed for the process of fat metabolism.
When the intensity of the load starts carbohydrate metabolism. It is more efficient than fat metabolism, but can produce a limited amount of energy. Carbohydrates are stored in the body as glycogen can provide energy for intense exercise for two hours. But after as the body runs out of their carbohydrate reserves, the athlete rapidly losing strength. Exercise can be continued only after the replenishment of carbohydrates in the body. That is why it is important to eat quickly digestible carbohydrates during prolonged exercise. If you do not replenish their carbohydrate reserves, you have to reduce the intensity of the workout so the body began to use fat as an energy source. With increasing intensity training efficiency of carbohydrate metabolism decreases, and the case enters the anaerobic metabolism. This is due to the fact that the body is not received enough oxygen for fat or carbohydrate metabolism. In fact, from a gram of carbohydrate you can get 20 times more energy in sufficient amounts of oxygen than in an environment where the body is not received sufficient quantity, that just happens in the anaerobic metabolism. If properly distributed loads, the mechanisms of energy metabolism in the body work for us, allowing to make your workout longer and harder. OnFit – directory of fitness clubs, sports shops, news and articles.